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    M1 5W30 HM, 5400 miles on oil, '01 Suburban 8.1L

    Here is the report: I could use some help interpreting the results...in the previous sample the oil was Valvoline 5W30 conventional non-synthetic. This report was Mobil 1 Hi-Mileage. What catches my eye is that calcium is way down, while Magnesium, Molybdenum, and zinc are up...are these...
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    Vortec 8.1L Oil Pressure/Filter question

    Last oil change I installed a Fram Ultra Guard since the Wal-Mart by me stopped carrying AC Delco filters. Local auto parts stores don't seem to carry the AC Delco filters either. Right after that I ordered some OEM PF-454 filters from Rock Auto so now I have a few on hand. On a road trip to...
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